Gas-furnace for melting metals



.(No Model.) 2 SheetsSheet 1,

H. H. GARRETT. GAS FURNACE FOR MELTING METALS.

No. 421,263. Patented Feb. 11 1890.

27 y jw. in A! M1444;

(Nb Model.) 2 Sheets-Sheet 2.

H. H. GARRETT.

GAS FURNACE FOR MELTING METALS.

No. 421,263. Patented Feb.v 11, 1 90.

UNITED STATES PATENT OFFICE.

HENRY H. GARRETT, OF PITTSBURG, PENNSYLVANIA.

GAS-FURNACE FOR MELTING METALS.

SPECIFICATION forming part of Letters Patent No. 421,263, dated February 11, 1890. Application filed August 5, 1889. Serial No. 319,712- (No model.)

To all whom it may concern.-

Be it known that I, HENRY I-I. GARRETT, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered a certain new and useful Improvement in Gas Furnaces for Melting Metals, of which improvement the following is a specification.

The object of my invention is to provide a furnace of simple, compact, and comparatively inexpensive construction, in which gaseous fuel may be utilized for melting brass or other metals without requiring the employment of crucibles.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a longitudinal central section through a gasfurnace embodying my invention; Figs. 2 and 3, transverse sections through the same at the lines a and y y, respectively, of Fig. 1; and Fig. 4, a vertical central section illustrating the application of my invention in a furnace of the cupola type.

In the practice of my invention I construct afurnace having substantially rectangular boundaries, in the lower portion of which I form one or more gas-flues 1, which extend horizontally from the front of the furnace to a point near its opposite end at which said fines, when more than one is employed, unite in a common vertical flue 2. A molten-metalreceiving chamber 3, having a hearth or bottom 4 of suitable refractory material, is formed in the furnace above the horizontal gas flue or fiues 1, being separated from the rear vertical flue 2 by abridge-wall 5 and extending therefrom to the front wall of the furnace, in which there is provided an opening 6, closed by a skimming-door 7, for the removal of im= purities from the surface of the molten metal. The moltenmetal-receiving chamber 3 is, except at its rear end, closed at its top by a horizontal wall 8, by which it is separated from a melting chamber 9, extending from the front wall of the furnace to the rear of the wall 8 and being provided With a front charging-openin g 10 and door 11 and a hearth or bottom 12, of refractory material, which is downwardly inclined from its front to its rear end. The rear gas-flue 2 leads at top into a lateral throat or passage 13, formed between the top of the bridge-wall 5 and a downwardly and forwardly inclined deflecting-wall 14, which extends from the flue 2 to a channel or passage 15, through which the throat 13 of said flue communicates with the melting-chamber 9 at the rear end of its hearth 12. A channel or passage 16, formed between the top of the bridge-wall 5 and the rear of the top wall 8 of the molten-metalreceiving chamber 3, establishes communication between said chamber at its rear end andtop and the flue 2 through the throat 13, and also between said chamber and the melting-chamber 9. A lateral discharge-flue 17 extends from each side of the moltenmetal-receiving chamber at the top of its hearth at the front end to a vertical flue 18, the flues 18 being connected at top bya transverse flue 19 with a horizontal flue 20, leading to a stack or chimney 21. 22 lead from the sides of the melting-chamber 9, near the front of its hearth, into the vertical discharge-fines 18.

In operation a charge of metal having been placed upon the hearth of the melting-chamber 9, a jet of gas is admitted to and ignited in one or both of the lower flues 1, being supplied by a burner-pipe 23, leading from a service-pipe 25 and controlled by a cook or valve 24. The air required for admixture with the gas is drawn into the fines 1 and the products of combustion of the mingled air and gas pass through the rear vertical gas-flue 2, throat 13, and passages and 16 into the melting-chamber 9 and molten-metalreceiving chamber 3, highly heating the same, and being thence discharged through the flues 22, 17, 18, 19, and into the stack 21. The charge of metal in the chamber 9 is Discharge-fines thereby brought to a state .of fusion, the

metal as melted dropping from the rear end of the hearth 12' into the lower receiving-- embodied in the same operative relation as above described in the cupola-furnace shown in Fig. 4, in which, as in all furnaces of this type, the melting-chamber 9 is vertical. A further structural modification is presented in the provision of means for the introduc tion of the heated products of combustion at both ends of the molten -metal receiving chamber 3 and at both sides of the meltingchamber 9, the discharge from both chambers being through lateral flues, as in the instance first described. A bridge-wall 5 and vertical gas-flue 2 are located at each end of the molten-metal-receiving chamber 3, and a series of horizontal gas-fines 1 is employed, one or more of said fines leading into the vertical flues 2 at one end of the chamber 3, and the remaining one or more into the flue at the opposite end. The top wall 8 of the chamber 3 is in the form of a substantial arch, at each end of which a vertical passage 10 leads from the delivery-throat- 13 of the adjacent vertical gas-flue 2 into the top of the chamber 3. The top of the arched wall 8 forms the hearth of a vertical melt-ingchamber 9, which communicates at each side by a passage 15 with the adjacent deliverythroat 13. The melting-chamber is closed at top by an arched roof 27, above which extends the stack 21, and is provided with an upper charging-opening 10, closed by a door 11.

Lateral discharge-fines 17 22 lead from the chambers 3 and 9 into vertical fiues 18,0pening into the stack above the roof.

The operation of the furnace is identical with that before described, and a thorough and effective application of the heat of the products of combustion is attained by the duplication of the passages for their delivery to the chambers 3 and 9.

I claim as my invention and desire to secure by Letters Patent- 1. In a furnace for melting metals, the combination of a molten-metal-receiving chamber, a bridge-Wall located at one end of said chamber, a gas-flue having a lateral throat or opening at the top of the bridge-wall, a meltingchamber located above and separated by a wall below its hearth from the receiylngchamber, channels or passages establishing communication between the melting-chamber and the receiving-chamber and between the throat of the gas-flue and each of said chambers, a stack or chimney, and discharge-fines leading from each of said chambers into the stack, substantially as set forth.

2. In a furnace for melting metals, the combination of a molten-1netal-receiving chamber, a bridge-wall located at one end of said chamber, a gas-flue having a lateral throat or opening at the top of the bridge-wall, a meltingchamber located above and separated by a wall below its hearth from the receivingchamber, a deflecting-wall forming the top of a connecting passage from the throat of the gas-flue to the melting-chamber, a channel or passage leading from the bottom of said connecting-passage to the receiving-chamber, and discharge-fines leading from the meltingchamber and the receiving-chamber, respectively, to the stack, substantially as set forth.

3. In a furnace for melting metals, the combination of a horizontal gas-fine, a burnerpipe leading into one end thereof, a moltenmetal-receiving chamber located above said gas-flue, a bridge-walllocated at one end of said chamber, a vertical gas-flue communieating with the end of the horizontal flue farthest from the burner-pipe and having a lateral throat or opening at the top of the bridge-wall, a melting-chamber located above the receiving-chamber, channels or passages establishing communication between the throat of the vertical flue and the adjacent ends of the melting and receiving chambers and between said chambers at said ends,-and lateraldischarge-flues leading from said chambers to a stack, substantially as set forth.

In testimony whereof I have hereunto set my hand.

HENRY H. GARRETT.

W'itnesses:

J. SNOWDEN BELL, R. H. WHITTLEsEY. 

